watch: fix watch args not being properly filtered

[dario-piotrowicz]

Currently the logic for filtering out watch related flags before passing them to the watch target script is flawed, as it includes any flag (starting with -) that follows a flag starting with --watch (code), this allows some watch flags to make it pass the filtering resulting in the generation of multiple watch processes which is both wasteful and can cause duplicate terminal logs (alongside other issues if the target script is side-effectful).

For example if I run

node --watch --watch index.js

the current implementation will spawn a process equivalent to:

node --watch index.js

which will then finally spawn the correct:

node index.js

Here I'm addressing the incorrect filtering so that all the watch flags are correctly filtered out (making the extra process spawning disappear)

---

Fixes https://github.com/nodejs/node/issues/57124

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.27%. Comparing base (25842c5) to head (685fb31). Report is 162 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57936      +/-   ##
==========================================
- Coverage   92.26%   90.27%   -1.99%     
==========================================
  Files         325      630     +305     
  Lines      126673   186112   +59439     
  Branches    20783    36470   +15687     
==========================================
+ Hits       116869   168017   +51148     
- Misses       9576    10976    +1400     
- Partials      228     7119    +6891     

see 412 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/66587/

[nodejs-github-bot]

Landed in 4acb85403950320773352ab127bee9fc85818153

[joyeecheung]

Actually, this PR landed despite failing many platforms in the test file it appends to: https://ci.nodejs.org/job/node-test-pull-request/66587/

[joyeecheung]

Sending a revert since it should not have landed https://github.com/nodejs/node/pull/58190

[dario-piotrowicz]

Actually, this PR landed despite failing many platforms in the test file it appends to: https://ci.nodejs.org/job/node-test-pull-request/66587/

Note: I've addressed those issues in https://github.com/nodejs/node/pull/58183, I wonder if there were actually other issues as well :thinking: